Novel Micronized Mica Modified Casein–Aluminum Hydroxide as Fire Retardant Coatings for Wood Products

Coatings

Olli Orell¹  Essi Sarlin¹  Maitham Alabbad²  Ling Li²  Antti Haapala³  Mezbah Uddin³ 

[1] Department of Materials Science and Environmental Engineering, Tampere University, FIN-33014 Tampere, Finland;School of Forest Resources, University of Maine, Orono, ME 04473, USA;School of Forest Sciences, University of Eastern Finland, FIN-80100 Joensuu, Finland;

关键词: composite coating;    flame retardancy;    thermal analysis;    wear testing;    wood;   

DOI  :  10.3390/coatings12050673

来源: DOAJ

【 摘 要 】

Sustainable coating solutions that function as a fire retardant for wood are still a challenging topic for the academic and industrial sectors. In this study, composite coatings of casein protein mixed with mica and aluminum trihydroxide (ATH) were tested as fire retardants for wood and plywood; coating degradation and fire retardancy performance were assessed with a cone calorimeter, and a thermogravimeter was used for the thermal stability measurement. The results indicated that casein–mica composites were beneficial as coatings. The heat release rate (HRR) and the total heat released (THR) of the sample coated with casein–mica composite were reduced by 55% and 37%, respectively; the time to ignition was increased by 27% compared to the untreated sample. However, the TTI of the sample coated with the casein–mica–ATH composite was increased by 156%; the PHR and THR were reduced by 31% and 28%, respectively. This is attributed to the yielded insulating surface layer, active catalytic sites, and the crosslink from mica and endothermic decomposition of ATH and casein producing different fragments which create multiple modes of action, leading to significant roles in suppressing fire spread. The multiple modes of action involved in the prepared composites are presented in detail. Coating wear resistance was investigated using a Taber Abrader, and adhesion interaction between wood and a coated composite were investigated by applying a pull-off test. While the addition of the three filler types to casein caused a decrease in the pull-off adhesion strength by up to 38%, their abrasion resistance was greatly increased by as much as 80%.

【 授权许可】

Unknown